The On-Line Encyclopedia of Integer Sequences (OEIS)

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A078658

a(0) = 1; for n>0, a(n) = 1 + coefficient of x^n in expansion of 1/Product_{ n >= 2, n not of the form 2^k-1 } (1-x^n).
(history; published version)

#3 by Russ Cox at Fri Mar 30 16:49:37 EDT 2012

AUTHOR

_N. J. A. Sloane (njas(AT)research.att.com), _, Dec 15 2002

Discussion

Fri Mar 30

16:49

OEIS Server: https://oeis.org/edit/global/110

#2 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

KEYWORD

nonn,new

nonn

AUTHOR

N. J. A. Sloane (njas, (AT)research.att.com), Dec 15 2002

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

a(0) = 1; for n>0, a(n) = 1 + coefficient of x^n in expansion of 1/Product_{ n >= 2, n not of the form 2^k-1 } (1-x^n).

DATA

1, 1, 2, 1, 3, 2, 4, 2, 6, 4, 9, 6, 13, 10, 19, 15, 28, 24, 41, 36, 59, 55, 85, 81, 121, 119, 171, 172, 240, 247, 335, 348, 464, 490, 639, 681, 874, 941, 1190, 1289, 1610, 1756, 2168, 2375, 2904, 3197, 3873, 4276, 5141, 5693, 6796, 7541, 8945, 9946, 11730, 13058, 15322, 17078

OFFSET

0,3

COMMENTS

a(n) = number of cobordism classes in dimension n.

REFERENCES

Robert E. Stong, Notes on Cobordism Theory, Princeton Univ. Press, 1968.

CROSSREFS

Cf. A078657.

KEYWORD

nonn

AUTHOR

njas, Dec 15 2002

STATUS

approved